Linear stabilizer with low pressure difference

Abstract

The invention discloses a linear stabilizer with a low pressure difference, which comprises a bias voltage generating circuit, an error amplifier, an output pipe and a quick response circuit, wherein the quick response circuit is used for sensing a load transient phase step by collecting an output voltage of the output pipe and supplying a pair of control signals to the error amplifier after the output voltage is coupled, reversely amplified and subjected to level shifting; the error amplifier is used for collecting a feedback voltage of the output pipe through a voltage-dividing network, comparing the feedback voltage with a reference voltage and performing direct current voltage stabilization on the output voltage of the output pipe; and the error amplifier has a structure of a transient switch pipe and is used for transiently switching an output-level current of the error amplifier according to the control signals so as to generate a driving signal to control the output pipe to response to the load transient phase step. Thus, the linear stabilizer provided by the invention meets the industrial design demand on the high-performance voltage-stabilized source, and the overshoot and undershoot of the output voltage under the condition of the load transient phase step are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a low-dropout linear regulator. Background technique [0002] Low-dropout linear regulator LDO (low-dropout regulator) is widely used in various analog, mixed-signal and radio frequency integrated circuit systems, such as implanted medical electronic equipment, mobile communication equipment, or power supplies for consumer electronics management module. It is used to provide a stable output voltage with load capability, and has the advantages of low static power consumption, low noise, and small circuit scale. Early low-dropout linear regulators usually need to add an external capacitor above the uF level to the output to ensure a good output load step response. However, more and more of the above-mentioned electronic devices adopt fully integrated system-on-chip (system-on-chip) to reduce size and save cost, and low dropout linear regulators without ext...

AI Technical Summary

Problems solved by technology

However, the added two comparator loops increase the static power consumption and low-frequency noise in the circuit while significantly increasing the circuit-level design scale.

Moreover, the voltage regulator also needs to generate two additional reference voltages VH, VL for the above-mentioned comparator, which further increases the circuit complexity and cost

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